feat(goodreads): fetch book images for updates

[chrisvogt]

This PR fetches and includes the book image data for the status updates collection in the Goodreads response.

[codecov]

Codecov Report

❌ Patch coverage is 38.15789% with 282 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.92%. Comparing base (0c0e12d) to head (e8f9580).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
functions/jobs/sync-goodreads-data.js	27.53%	279 Missing ⚠️
...nctions/api/goodreads/fetch-recently-read-books.js	91.66%	2 Missing ⚠️
functions/api/google-books/fetch-book.js	97.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   79.38%   73.92%   -5.47%     
==========================================
  Files          50       50              
  Lines        3095     3528     +433     
  Branches      369      406      +37     
==========================================
+ Hits         2457     2608     +151     
- Misses        638      920     +282     

Flag	Coverage Δ
unittests	73.92% <38.15%> (-5.47%)	⬇️

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